According to an article in LA Weekly, Cincinnati-based McDonald's franchisee Lou Groen invented the Filet-O-Fish sandwich in 1962. Apparently, he was having an issue selling his burgers to our huge Catholic population during Lent.
So he called up McDonald's founder Ray Kroc and explained his dilemma, suggesting they try selling a fish sandwich instead. Kroc said OK, but only if they also tested his invention: the Hula Burger, a slab of grilled pineapple and cheese on a cold bun. Kroc and Groen had a contest to see which would sell better. The fish sandwich won and fast-food fish sandwiches were born to the happiness of pescetarians, Catholics and cows nationwide. Wonder what would have happened if the pineapple burger won?
Read the whole article here.